1-2+3-4+5.+99-100
1-2+3-4+5.+99-100
数学人气：513 ℃时间：2020-02-03 03:26:59
优质解答
1-2+3-4+5.+99-100 = (1-2) + (3-4) + (5-6) + .+ (99-100) = (-1) * 100/2 = -50
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